Biological information display apparatus

Abstract

A biological information display apparatus includes a pulse wave acquisition part, an index derivation part, a determination part, and a display control part. The pulse wave acquisition part acquires a pulse wave signal obtained by measuring a pulse wave of a subject person along a time axis. The index derivation part derives breathing function indexes which are indexes showing states of breathing function of the subject person. The determination part determines whether at least one of the derived multiple breathing function indexes is in a predetermined range as a range of a threshold showing that the subject person gets worse. When at least one of breathing function indexes is in the predetermined range, the display control part displays progress information showing the progress of multiple breathing function indexes since becoming in the predetermined range by the at least one of breathing function indexes.

What is claimed is: 
     
         1 . A biological information display apparatus comprising:
 a pulse wave acquisition part that acquires a pulse wave signal obtained by measuring a pulse wave of a subject person along a time axis;   an index derivation part that derives a breathing function index including a plurality of indexes showing a state of a breathing function of the subject person, based on the pulse wave signal acquired by the pulse wave acquisition part;   a determination part that determines whether at least one of the plurality of the breathing function indexes derived by the index derivation part is in a determined range predetermined as a range of a threshold showing that a condition of the subject person gets worse; and   a display control part that displays progress information showing progress of the plurality of the breathing function indexes from when the at least one of the plurality of the breathing function indexes is included in the predetermined range in a case that the at least one of the plurality of the breathing function indexes is included in the predetermined range as a result of determination by the determination part.   
     
     
         2 . The biological information display apparatus according to  claim 1 , wherein:
 the display control part displays transition information associated along the time axis with each transition of the plurality of the breathing function indexes, as the progress information.   
     
     
         3 . The biological information display apparatus according to  claim 2 , wherein:
 the display control part displays the transition information in the display range along the predetermined time axis when the all of the plurality of the breathing function indexes are outside the predetermined range as the result of the determination by the determination part; and   the display control part enlarges the time axis of the display range and displays the transition information when the at least one of the plurality of the breathing function indexes is included in the predetermined range as the result of the determination so that the progress of the plurality of the breathing function indexes from when the at least one of the plurality of the breathing function indexes is included in the predetermined range is shown.   
     
     
         4 . The biological information display apparatus according to  claim 1 , wherein:
 the display control part displays the progress time from when the at least one of the plurality of the breathing function indexes is included in the predetermined range as the progress information.   
     
     
         5 . The biological information display apparatus according to  claim 1 , further comprising:
 a report control part that reports that the condition of the subject person gets worse when the at least one of the plurality of the breathing function indexes is included in the predetermined range as the result of the determination by the determination part.   
     
     
         6 . The biological information display apparatus according to  claim 1 , further comprising:
 an intrathoracic pressure calculation part that calculates an intrathoracic pressure of the subject person based on the pulse wave acquired by the pulse wave acquisition part;   a breathing acquisition part that acquires a breathing signal, which shows a magnitude of an intraoral pressure of the subject person at when the subject person breathes in a different depth along the time axis, the breathing signal being associated with the pulse wave signal acquired by the pulse wave acquisition part along the time axis; and   a coefficient calculation part that calculates as a calibration coefficient, a ratio of the variation amount from a preset second reference value of an amplitude of the pulse wave signal to a variation amount from a preset first reference value of the intraoral pressure shown by the breathing signal, based on the breathing signal acquired by the breathing acquisition part and on the pulse wave acquisition signal acquired by the pulse wave acquisition part,   wherein:   the index derivation part derives an absolute value of the intrathoracic pressure of the subject person as one of the plurality of the breathing function indexes, the absolute value of the intrathoracic pressure of the subject person being a result of multiplying an estimation intrathoracic pressure by the calibration coefficient, the estimation intrathoracic pressure being a relative value of the intrathoracic pressure estimated based on the pulse wave signal acquired by the pulse wave acquisition part, the calibration coefficient being calculated by the coefficient calculation part.   
     
     
         7 . The biological information display apparatus according to  claim 1 , wherein:
 the index derivation part derives at least one of a breathing rate, a breathing rhythm, or a presence of a breathing of the subject person, as one of the plurality of the breathing function indexes.   
     
     
         8 . The biological information display apparatus according to  claim 1 , wherein:
 the pulse wave acquisition part acquires the pulse wave signal from an optical pulse wave sensor measuring the pulse wave signal of the subject person based on a result of receiving light after emitting light waves that have two wavelengths different from each other; and   the index derivation part derives an oxygen saturation concentration of the subject person as one of the plurality of the breathing function indexes, based on the pulse wave signal.   
     
     
         9 . The biological information display apparatus according to  claim 1 , wherein:
 the index derivation part derives the pulse rate of the subject person as one of the plurality of the breathing function indexes.   
     
     
         10 . The biological information display apparatus according to  claim 1 , wherein:
 the pulse wave acquisition part acquires the pulse wave signal from the pulse wave sensor attached to a tip of a finger of the subject person.   
     
     
         11 . The biological information display apparatus according to  claim 1 , further comprising:
 an output part that outputs to an external apparatus, the at least one of the plurality of the breathing function indexes or the progress information.   
     
     
         12 . The biological information display apparatus according to  claim 11 , wherein:
 the output part outputs the at least one of the plurality of the breathing function indexes or the progress information to a portable auxiliary storage apparatus as the external apparatus.